Need some help on some glow plugs - Ford Powerstroke Diesel Forum
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post #1 of 6 Old 01-15-2014, 09:36 PM Thread Starter
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Need some help on some glow plugs

This is not my truck. This truck was just bought from the original owner. Has 90k on the ticker. It will not start without being plugged in. Fires right up after being plugged in for a few hours. Has new OEM glow plug relay. Temps have been 25-30 degrees. The wait to start light only stays on for 8 seconds or so. If the truck has been plugged in the wait to start light is only on for a few seconds. My other 96 I will turn the key to the on position and it will take 45 seconds or so until that light turns off. Then the truck fires right up. Any ideas?

1996 F250 crew cab. Hypermax intercooler, Gearhead tunes, 4" exhaust, 6637 intake, Autometer gauges, Dana 60, 6.0 cooling fan, Built e40d, Firestone airbags, Full Force stage ones more to come.
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post #2 of 6 Old 01-15-2014, 10:26 PM
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First, if all sensors are working correctly, wts light is not a indicator of gp operation, the pcm can command the gps to run for up to two minutes.
easy things first : gp's are easy, get motorcraft zd11s, check the uvch, as well as pigtails and valve cover gaskets for any burnt pins. replace any suspect with good quality ones, not doormans.

Axel --> 16yo
96 CCLB srw. built E4OD, Diy E-fuel, Autometer gauges
4:10 lsd, Toyo M55 on stock steelies

Future plans include diy Traction bars, and zf5 swap.
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post #3 of 6 Old 01-15-2014, 10:36 PM
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You can check the glow plugs with an ohm meter and check the relay with a volt meter. Look it up on youtube.

If that all tests good, your injectors might be worn out. Synthetic 5w40 will help a lot with cold starts on these engines.

When I first bought my '03 it wouldn't start without being being plugged in at any temperature. In the end, rotella t6 allow the injectors to work when cold.
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post #4 of 6 Old 01-16-2014, 11:19 AM Thread Starter
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How does the pcm decide how long the glow plugs stay on? I assume a reading from a coolant temp sensor.

1996 F250 crew cab. Hypermax intercooler, Gearhead tunes, 4" exhaust, 6637 intake, Autometer gauges, Dana 60, 6.0 cooling fan, Built e40d, Firestone airbags, Full Force stage ones more to come.
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post #5 of 6 Old 01-16-2014, 11:26 AM
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IIRC, a baro, a oil temp sensor, and a coolant sensor.

Axel --> 16yo
96 CCLB srw. built E4OD, Diy E-fuel, Autometer gauges
4:10 lsd, Toyo M55 on stock steelies

Future plans include diy Traction bars, and zf5 swap.
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post #6 of 6 Old 01-16-2014, 11:28 AM
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Coolant temp sensor does not even go to the PCM. It goes by EOT - engine oil temp sensor.
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